Door handle safety lock

ABSTRACT

A door handle safety lock comprises a button, a pedestal, a limited support arm and a spring, the outer wall the button is provided with retaining ribs; the top of the pedestal is provided with inserting parts, a first mounting hole matched with the button is arranged in the inserting part, and the first chutes are arranged on the inner wall of the first mounting hole; the end of the limited support arm which is close to the pedestal is provided with an inserting slot which is matched with the inserting part, the outer wall of the limited support arm which is close to the pedestal is provided with a second mounting hole which is matched with the button, and the second chute are arranged on the inner wall of the second mounting hole; and the spring is installed between the button and the hole bottom of the second mounting hole.

TECHNICAL FIELD

The invention relates to the technical field of safety locks, inparticular to a door handle safety lock.

BACKGROUND TECHNOLOGY

At present, most of the door locks in the market are openedcentrifugally in a single direction. The door can be opened by rotatingthe door lock handle, and it is extremely convenient to use. However,for children at home, potential risks exist in such circumstances. Withgrowth of the children, they are more and more curious about this world,and they may usually open doors and go out of the sight of adults. Inorder to prevent the children from open the room doors, the entrancedoors, etc. at home, it is required to use door handle locks forprotection, while most of various child locks in the market currentlyhave the problems of a complex structure, too many parts and high cost.

INVENTION CONTENT

The invention aims to solve the problems existing in the prior art andprovide a door handle safety lock which is simple in structure andconvenient to operate. This safety lock can be used for locking the doorlock handle and preventing the children from opening the room doors, theentrance doors, etc. to reduce potential risks. It has thecharacteristics of low cost, simple assembly process, high reliability,rapid installation and convenience in use.

In order to achieve the above mentioned purposes, the invention isrealized through the following technical scheme:

A door handle safety lock, comprising:

A button (1), the outer wall on one end of the said button (1) isprovided with retaining ribs (11);

A pedestal (2), the top of the said pedestal (2) is provided withinserting parts (21), a first mounting hole (22) which is matched withthe button (1) is arranged in the said inserting part (21), and thefirst chutes (23) which are matched with the retaining ribs (11) arearranged on the inner wall of the first mounting hole (22);

A limited support arm (3), the end of the said limited support arm (3)which is close to the pedestal (3) is provided with an inserting slot(31) which is matched with the inserting part (21), the outer wall ofthe said limited support arm (3) which is close to the pedestal (2) isprovided with a second mounting hole (32) which is matched with thebutton (1), the said second mounting hole (32) is communicated with theinserting slot (31), the center line of the said second mounting hole(32) is coincided with that of the first mounting hole (22), and thesecond chutes (33) which are matched with the retaining ribs (11) arearranged on the inner wall of the said second mounting hole (32);

A spring (4), the said spring (4) is installed between the button (1)and the hole bottom of the second mounting hole (32);

When the said button (1) is not pressed, a part of the said retainingribs (11) are positioned in the first chutes (23), and the other part ispositioned in the second chutes (33).

The said limited support arm (3) consists of the first support unit (34)and the second support unit (35) in a combined manner, the side of thesaid first support unit (34) which is away from the second support unit(35) is a flat bearing surface, and the said inserting slot (31) ispositioned on the end side of the second support unit (35).

The said first support unit (34) and the second support unit (35) arecover bodies having cavities.

The said first support unit (34) is provided with inserting posts (36),and the said second support unit (35) is provided with inserting holes(37) which are matched with the inserting posts (36).

The bottom of the said pedestal (2) is provided with non-settingadhesive (24), and the said pedestal (2) is fixed onto the door bodythrough the non-setting adhesive (24).

The outer wall of the said button (1) is provided with a snap (12), andthe inner wall of the second mounting hole (32) is provided with aclamping slot (38) which is matched with the snap (12).

One end of the said button (1) is provided with an accommodating andmounting cavity (13) which is matched with the spring (4).

The said retaining ribs (11) comprise a first retaining rib (111) and aplurality of second retaining ribs (112), the width of the said firstretaining rib (111) is greater than that of the second retaining rib(112), the quantity of the said first chutes (23) and the second chutes(33) is the same as that of the retaining ribs (11), a plurality of thesaid first chute (23) comprise three third chutes (231) which arematched with the first retaining ribs (111), the distance between theadjacent said third chutes (231) corresponds to one fourth of thecircumference to the first mounting hole (22), and a plurality of thesaid second chutes (33) comprise a fourth chute (331) which is matchedwith the first retaining rib (111).

The quantity of the said inserting part (21) is two.

The outer wall of the button (1) which is close to one end of theretaining ribs (11) is provided with bosses (14), and the inner wall ofthe said first mounting hole (22) is provided in an array manner with aplurality of grooves (221) which are matched with the bosses (14).

Compared with the prior art, the invention has the beneficial effectsthat:

The safety lock in the invention is fixed onto the door body through thepedestal. When the safety lock in the invention is installed onto thedoor lock handle, the button is inserted into the second mounting holeand the first mounting hole, and the button is not pressed, the safetylock in the invention is in the locked state. A part of the retainingribs are positioned in the first chutes, and the other part of theretaining ribs are positioned in the second chutes, which can preventthe limited support arm from rotating and lock the limited support armonto the pedestal. The limited support arm provides limited support forthe door lock handle, and it can limit the door lock handle and preventthe door lock handle from rotating to further prevent the door lock fromopening; when pressing the button, the spring retracts, and all of theretaining ribs enter into the first chutes or enter into the secondchutes. At this moment, the safety lock in the invention is in theunlocked state, the limited support arm can rotate around the button,the limited support arm can be toggled to the state which is away fromthe door lock handle, and when the limit state of the door lock handleis unlocked, the door lock can be opened smoothly. For the door lockwhich can be centrifugally opened in double directions, the safety lockin the invention are installed both on the upper and the lower sides ofthe door lock handle for limitation, so that the door lock handle can belocked to prevent the door lock from being opened accidentally. Thesafety lock in the invention can be operated by a single hand, and it isconvenient to use. The locking of the door lock handle can be completedby means of the safety lock in the invention through coordination of thespring, the retaining ribs and two chutes. The structure is simple, thecost is low, and the reliability is high, it can be used for locking thedoor lock handle and preventing the children from opening the roomdoors, the entrance doors, etc. to reduce potential risks. It has thecharacteristics of simple assembly process, rapid installation andconvenience in use.

DESCRIPTION OF FIGURES

FIG. 1 is the structure schematic diagram of the invention;

FIG. 2 is the first exploded view of the invention;

FIG. 3 is the second exploded view of the invention;

FIG. 4 is the structure schematic diagram of the button;

FIG. 5 is the structure schematic diagram of the pedestal;

FIG. 6 is the structure schematic diagram of the limited support arm;

FIG. 7 is the schematic diagram of the invention in the locked state;

FIG. 8 is the schematic diagram of the invention in the unlocked state;

FIG. 9 is the schematic diagram of the door lock handle in the lockedstate;

FIG. 10 is the top view of FIG. 9;

FIG. 11 is the schematic diagram of the door lock handle in the unlockedstate;

FIG. 12 is the top view of FIG. 11;

FIG. 13 is the schematic diagram of the door lock in the open state;

FIG. 14 is the structure schematic diagram of the button in Embodiment3;

FIG. 15 is the structure schematic diagram of the pedestal in Embodiment3;

FIG. 16 is the structure schematic diagram of the limited support arm inEmbodiment 3;

FIG. 17 is the structure schematic diagram of the boss in Embodiment 3;and

FIG. 18 is the structure schematic diagram of the groove in Embodiment3.

Numbers in the figures: 1. Button; 11. retaining ribs; 111. the firstretaining rib; 112. the second retaining rib; 12. Snap; 13.accommodating and mounting cavity; 14. boss; 2. pedestal; 21. insertingpart; 22. the first mounting hole; 221. groove; 23. the first chute;231. the third chute; 24. non-setting adhesive; 3. limited support arm;31. inserting slot; 32. the second mounting hole; 33. the second chute;331. the fourth chute; 34. the first support unit; 35. the secondsupport unit; 36. inserting posts; 37. inserting holes; 38. clampingslot; 4. spring; and 5. door lock handle.

EMBODIMENTS

The door handle safety lock described in the invention comprises:

Button 1, the retaining ribs 11 are arranged on the outer wall on oneend of the said button 1, and the retaining ribs 11 are arranged alongthe length direction of the button 1;

Pedestal 2, the pedestal 2 is used for fixing the safety lock of theinvention on the door body, the top of the said pedestal 2 is providedwith the inserting parts 21, the said inserting parts 21 are providedwith the first mounting hole 22 which is matched with the button 1, thefirst chute 23 which is matched with the retaining ribs 11 is arrangedon the inner wall of the first mounting hole 22, and the retaining ribs11 can slide in the first chute 23. The button 1 can be inserted intothe first mounting hole 22, and the button 1 can slide in the firstmounting hole 22;

Limited support arm 3, the limited support arm 3 provides limitation forthe door lock handle 5. It is used for preventing the door lock handle 5from rotating to lock the door lock handle 5. The inserting slot 31which is matched with the inserting parts 21 is arranged on the endwhich is close to the pedestal 2 of the said limited support arm 3. Thesecond mounting hole 32 which is matched with the button 1 is arrangedon the outer wall on the end of the said limited support arm which isclose to the pedestal 2. The said mounting hole 32 is communicated withthe inserting slot 31, and the center line of the said second mountinghole 32 is coincided with that of the first mounting hole 22. The secondchute 33 which is matched with the retaining ribs 11 is arranged on theinner wall of the second mounting hole 32. The retaining ribs 11 canslide in the second chute 33, the button 1 can be inserted into thesecond mounting hole 32, and the button 1 can slide in the secondmounting hole 32;

Spring 4, the said spring 4 is installed between the button 1 and thehole bottom of the second mounting hole 32; and the spring 4 providesoutward thrust for the button 1. When the button 1 is not pressed, apart of the said retaining ribs 11 are positioned in the first chute 23,and the other part of the retaining ribs are positioned in the secondchute 33.

The safety lock is fixed onto the door body through the pedestal 2, andthe pedestal 2 is installed in the door lock handle 5 of the door body.The button 1 is inserted in the second mounting hole 32 and the firstmounting hole 22. When the button 1 is not pressed, the safety lock ofthe invention is in the locked state, a part of the retaining ribs 11are positioned in the first chute 23, and the other part of theretaining ribs are positioned in the second chute 33, which can preventthe limited support arm 3 from rotating to lock the limited support arm3 onto the pedestal 2. The limited support arm 3 provides limitedsupport for the door lock handle 5. It can limit the door lock handle 5to prevent from the door lock handle 5 from rotating and further preventthe door lock 5 from opening; when the button 1 is pressed, the spring 4retracts, all of the retaining ribs 11 enter into the first chute 23 orinto the second chute 33, at this moment, the safety lock of theinvention is in the locked state, and the limited support arm 3 canrotate around the button. When the limited support arm 3 is toggled awayfrom the door lock handle 5, the limit state of the door lock handle 5can be locked, and the door lock can be opened smoothly. For the doorlock which can be opened centrifugally in both directions, the safetylock of the invention is installed on both upper and lower sides of thedoor lock handle 5 for limitation, and the door lock handle 5 can belocked to prevent from being opened accidentally. Furthermore, thesafety lock of the invention can be operated with a single hand, and itis convenient to use. Through coordination of the spring 4, theretaining ribs 11 and two chutes, the locking of the door lock handlecan be completed through the safety lock of the invention. It is simplein structure, low in cost and high in reliability, which can be used forlocking the door lock handle, preventing the children from opening theroom doors, the entrance doors, etc., so that potential risks can bereduced. It has the characteristics of simple assembly process, rapidinstallation and convenience in use.

In order to facilitate manufacturing of the limited support arm, thesaid limited support arm 3 consists of the first support unit 34 and thesecond support unit 35 in a combined manner. The side of the said firstsupport unit 34 which is away from the second support unit 35 is a flatbearing surface, which can provide stable support for the door lockhandle 5. The said inserting slot 31 is positioned on the side of theend part to the second support unit 35, which can facilitate theprocessing of the inserting slot 31 and the manufacturing of the limitedsupport arm.

In order to reduce manufacturing cost of the limited support arm, thesaid first support unit 34 and the second support unit 35 are coverbodies with cavities, which can reduce manufacturing materials of thelimited support arm and reduce the manufacturing cost of the limitedsupport arm.

In order to facilitate assembly of the limited support arm, the saidfirst support unit 34 is provided with inserting posts 36, and the saidsecond support unit 35 is provided with the inserting holes 37 which arematched with the inserting posts 36. Align the inserting posts 36 on thefirst support unit 34 to the inserting holes 37 on the second supportunit 35, then buckle the first support unit 34 and the second supportunit 35, and weld both of them, the assembly of the limited support armis completed, which can prevent the first support unit 34 and the secondsupport unit 35 from being installed in an inclined manner.

In order to facilitate fixation of the safety lock in the invention,non-setting adhesive 24 is arranged in the bottom part of the saidpedestal 2. The said pedestal 2 is fixed onto the door body through thenon-setting adhesive, which can prevent from damaging the door body, sothat the fixation of the safety lock in the invention is facilitated.

In order to facilitate installation of the button, the snap 12 isarranged on the outer wall of the button 1, and the clamping slot 38which is matched with the snap 12 is arranged on the inner wall of thesecond mounting hole 32. Insert the button 1 into the second mountinghole 32, through coordination between the snap 12 and the clamping slot38, the button 1 is locked in the second mounting hole 32 to prevent thebutton 1 from dropping, and the assembly is convenient and rapid.

In order to reduce the volume of the safety lock in the invention, oneend of the said button 1 is provided with the accommodating and mountingcavity 13 which is matched with the spring 4, and a part of the spring 4is positioned in the accommodating and mounting cavity 13, so that thevolume of the safety lock in the invention can be reduced.

In order to avoid accidental locking, the said retaining ribs 11comprise a first retaining rib 111 and a plurality of second retainingribs 112. The width of the said first retaining rib 111 is greater thanthat of the second retaining rib 112. The quantity of the said firstchute 23 and the second chute 33 is the same as that of the retainingribs 11. The plurality of the said first chute 23 comprises three thirdchutes 231 which are matched with the first retaining rib 111. Thedistance between the adjacent said third chutes 231 corresponds to onefourth circumference of the first mounting hole 22. The plurality of thesaid second chute 33 comprises a fourth chute 331 which is matched withthe first retaining rib 111. Only when the first retaining rib 111enters the fourth chute 331 and one of the third chutes 231simultaneously, the safety lock is in the locked state, and it can onlybe positioned at 90 degrees. The purpose of such a design is to preventthe children from being locked in the room caused by accidental lockingof the safety lock.

In order to be suitable for the door lock which is opened centrifugallyin double directions, the quantity of the said inserting parts 21 istwo. Each inserting part 21 is installed with the limited support arm 3and the button 1, wherein one of the limited support arms 3 ispositioned on the upper side of the door lock handle 5, the other one ispositioned on the lower side of the door lock handle 5, which canprevent the door lock handle 5 from rotating and locking the door lockwhich can be opened centrifugally in both directions.

In order to increase the using feel, the outer wall of the button 1which is close to one end of the retaining ribs 11 is provided withbosses 14, and the inner wall of the said first mounting hole 22 isprovided in an array manner with a plurality of grooves 221 which arematched with the bosses 14, and the bosses 14 are matched with thegrooves 221, which can realize positioning during the rotatingtransition and increase the rotation feel.

Embodiment Embodiment 1

The door handle safety lock described in the invention comprises:

Button 1, the retaining ribs 11 are arranged on the outer wall on oneend of the said button 1, and the retaining ribs 11 are arranged alongthe length direction of the button 1. The quantity of the retaining ribs11 is multiple. Through coordination of multiple retaining ribs 11, thelocking is enabled to be more secure, and the locking effect can beincreased.

Pedestal 2, the pedestal 2 is used for fixing the safety lock of theinvention on the door body. Preferably, the bottom of the said pedestal2 is provided with non-setting adhesive 24, the said pedestal 2 is fixedonto the door body through the non-setting adhesive 24, which canprevent from damaging the door body and facilitate fixation of thesafety lock in the invention. The top of the said pedestal 2 is providedwith inserting parts 21, and the inserting parts 21 and the pedestal 2adopt the integrated structure. The said inserting parts 21 are providedwith the first mounting hole 22 which is matched with the button 1, andthe diameter of the second mounting hole 22 is slightly greater than theouter diameter of the button 1. The inner wall of the said firstmounting hole 22 is provided with the first chute 23 which is matchedwith the retaining ribs 11, and the first chute 23 is arranged axiallyalong the full length of the first mounting hole 22. The retaining ribs11 can slide in the first chute 23, the button 1 can be inserted intothe first mounting hole 22, and the button 1 can slide in the firstmounting hole 22.

The snap 12 is arranged on the outer wall of the button 1, and theclamping slot 38 which is matched with the snap 12 is arranged on theinner wall of the second mounting hole 32. Insert the button 1 into thesecond mounting hole 32, through coordination between the snap 12 andthe clamping slot 38, the button 1 is locked in the second mounting hole32 to prevent the button 1 from dropping, and the assembly is convenientand rapid.

Limited support arm 3, the limited support arm 3 provides limitation forthe door lock handle 5. It is used for preventing the door lock handle 5from rotating to lock the door lock handle 5. The inserting slot 31which is matched with the inserting parts 21 is arranged on the endwhich is close to the pedestal 2 of the said limited support arm 3. Thesecond mounting hole 32 which is matched with the button 1 is arrangedon the outer wall on the end of the said limited support arm which isclose to the pedestal 2. The said mounting hole 32 is communicated withthe inserting slot 31, and the center line of the said second mountinghole 32 is coincided with that of the first mounting hole 22. The secondchute 33 which is matched with the retaining ribs 11 is arranged on theinner wall of the second mounting hole 32. The retaining ribs 11 canslide in the second chute 33, the button 1 can be inserted into thesecond mounting hole 32, and the button 1 can slide in the secondmounting hole 32. The inserting slot 31 divides the second mounting hole32 into the left part and the right part, and meanwhile it also dividesthe second chute 33 into the left part and the right part. The leftlength of the second chute 33 shall be greater than the length of theretaining ribs 11, so that it is ensured that when pressing the button1, all the retaining ribs 11 enter the left part of the second chute 33.The said limited support arm 3 consists of the first support unit 34 andthe second support unit 35 in a combined manner. The side of the firstsupport unit 34 which is away from the second support unit 35 is a flatbearing surface. The flat bearing surface can provide stable support forthe door lock handle 5. The said inserting slot 31 is positioned on theside on the end of the second support unit 35, which can facilitate theprocessing of the inserting slot 31 and the manufacturing of the limitedsupport arm. Furthermore, the said first support unit 34 and the secondsupport unit 35 are cover bodies with cavities, which can reducemanufacturing materials of the limited support arm and the manufacturingcost of the limited support arm. Preferably, the said first support unit34 is provided with inserting posts 36, the said second support unit 35is provided with the inserting holes 37 which are matched with theinserting posts 36. Align the inserting posts 36 on the first supportunit 34 to the inserting holes 37 on the second support unit 35, thenbuckle the first support unit 34 and the second support unit 35, andweld both of them, the assembly of the limited support arm is completed,which can prevent the first support unit 34 and the second support unit35 from being installed in an inclined manner.

Spring 4, the said spring 4 is installed between the button 1 and thehole bottom of the second mounting hole 32, and one end of the button 1is provided with the accommodating and mounting cavity 13 which ismatched with the spring 4. Apart of the spring 4 is positioned in theaccommodating and mounting cavity 13, so that the volume of the safetylock in the invention can be reduced. The spring 4 provides outwardthrust for the button 1. When the button 1 is not pressed, a part of thesaid retaining ribs 11 are positioned in the first chute 23, and theother part of the retaining ribs are positioned in the second chute 33.

The assembly method and steps of the invention are as below:

Step 1: Carry out the assembly of the limited support arm 3. Buckle thefirst support unit 34 and the second support unit 35. Use ultrasonicwelding equipment to weld it and form the limited support arm 3 (thefirst support unit 34 and the second support unit 35 can also be fixedtogether through screws and glue);

Step 2: Clamp the spring 4 into the button 1 to finish the assembly ofthe button 1;

Step 3: Insert the inserting parts 21 on the pedestal 2 into theinserting slot 31 of the limited support arm 3;

Step 4: Axially thrust the button 1 into the second mounting hole 32 onthe limited support arm 3. The button 1 sequentially passes through theright part of the second mounting hole 32, the first mounting hole 22,and the left part of the second mounting hole 32. The button 1 is lockedinto the second mounting hole 32 through coordination between the snap12 and the clamping slot 38;

Step 5: Paste the non-setting adhesive 24 onto the bottom of thepedestal 2.

The safety lock is fixed onto the door body through the pedestal 2, andthe pedestal 2 is installed in the door lock handle 5 of the door body.The button 1 is inserted in the second mounting hole 32 and the firstmounting hole 22. When the button 1 is not pressed, the safety lock ofthe invention is in the locked state, a part of the retaining ribs 11are positioned in the first chute 23, and the other part of theretaining ribs are positioned in the second chute 33, which can preventthe limited support arm 3 from rotating to lock the limited support arm3 onto the pedestal 2. The limited support arm 3 provides limitedsupport for the door lock handle 5. It can limit the door lock handle 5to prevent from the door lock handle 5 from rotating and further preventthe door lock 5 from opening; when the button 1 is pressed, the spring 4retracts, all of the retaining ribs 11 enter into the left part of thesecond chute 33, at this moment, the safety lock of the invention is inthe locked state, and the limited support arm 3 can rotate around thebutton. When the limited support arm 3 is toggled away from the doorlock handle 5, the limit state of the door lock handle 5 can be locked,and the door lock can be opened smoothly. For the door lock which can beopened centrifugally in both directions, the safety lock of theinvention is installed on both upper and lower sides of the door lockhandle 5 for limitation, and the door lock handle 5 can be locked toprevent from being opened accidentally. Furthermore, the safety lock ofthe invention can be operated with a single hand, and it is convenientto use. Through coordination of the spring 4, the retaining ribs 11 andtwo chutes, the locking of the door lock handle can be completed throughthe safety lock of the invention. It is simple in structure, low in costand high in reliability, which can be used for locking the door lockhandle, preventing the children from opening the room doors, theentrance doors, etc., so that potential risks can be reduced. It has thecharacteristics of simple assembly process, rapid installation andconvenience in use.

Embodiment 2

Except for the quantity of the inserting parts 21, this embodiment issame as the Embodiment 1. In order to be suitable for the door lockwhich is opened centrifugally in both directions, the quantity of thesaid inserting parts 21 is two, each inserting part 21 is installed withthe limited support arm 3 and the button 1, wherein one of the limitedsupport arms 3 is positioned on the upper side of the door lock handle5, and the other one is positioned on the lower side of the door lockhandle 5, so that the rotation of the door lock handle 5 can be avoided,and the door lock which is opened centrifugally in both directions canbe locked.

Embodiment 3

On the basis of the Embodiment 1, the retaining ribs 11 are divided intotwo types with different sizes. The said retaining ribs 11 comprise afirst retaining rib 111 and a plurality of second retaining ribs 112.The width of the said first retaining rib 111 is greater than that ofthe second retaining rib 112. The quantity of the said first chute 23and the second chute 33 is the same as that of the retaining ribs 11.The plurality of the said first chute 23 comprises three third chutes231 which are matched with the first retaining rib 111. The distancebetween the adjacent said third chutes 231 corresponds to one fourthcircumference of the first mounting hole 22. The plurality of the saidsecond chute 33 comprises a fourth chute 331 which is matched with thefirst retaining rib 111. Only when the first retaining rib 111 entersthe fourth chute 331 and one of the third chutes 231 simultaneously, thesafety lock is in the locked state, and it can only be positioned at 90degrees. The purpose of such a design is to prevent the children frombeing locked in the room caused by accidental locking of the safetylock. Meanwhile, a boss 14 can also be set on the outer wall on the endof the button 1 which is close to the retaining ribs 11, and the innerwall of the said first mounting hole 22 is provided in an array mannerwith a plurality of grooves 221 which are matched with the bosses 14,and the bosses 14 are matched with the grooves 221, which can realizepositioning during the rotating transition and increase the rotationfeel.

What is claimed is:
 1. A door handle safety lock, comprising: A button(1), the outer wall on one end of the said button (1) is provided withretaining ribs (11); A pedestal (2), the top of the said pedestal (2) isprovided with inserting parts (21), a first mounting hole (22) which ismatched with the button (1) is arranged in the said inserting part (21),and the first chutes (23) which are matched with the retaining ribs (11)are arranged on the inner wall of the first mounting hole (22); Alimited support arm (3), the end of the said limited support arm (3)which is close to the pedestal (3) is provided with an inserting slot(31) which is matched with the inserting part (21), the outer wall ofthe said limited support arm (3) which is close to the pedestal (2) isprovided with a second mounting hole (32) which is matched with thebutton (1), the said second mounting hole (32) is communicated with theinserting slot (31), the center line of the said second mounting hole(32) is coincided with that of the first mounting hole (22), and thesecond chutes (33) which are matched with the retaining ribs (11) arearranged on the inner wall of the said second mounting hole (32); Aspring (4), the said spring (4) is installed between the button (1) andthe hole bottom of the second mounting hole (32); When the said button(1) is not pressed, a part of the said retaining ribs (11) arepositioned in the first chutes (23), and the other part is positioned inthe second chutes (33).
 2. The door handle safety lock according toclaim 1, the said limited support arm (3) consists of the first supportunit (34) and the second support unit (35) in a combined manner, theside of the said first support unit (34) which is away from the secondsupport unit (35) is a flat bearing surface, and the said inserting slot(31) is positioned on the end side of the second support unit (35). 3.The door handle safety lock according to claim 2, the said first supportunit (34) and the second support unit (35) are cover bodies havingcavities.
 4. The door handle safety lock according to claim 2, the saidfirst support unit (34) is provided with inserting posts (36), and thesaid second support unit (35) is provided with inserting holes (37)which are matched with the inserting posts (36).
 5. The door handlesafety lock according to claim 3, the said first support unit (34) isprovided with inserting posts (36), and the said second support unit(35) is provided with inserting holes (37) which are matched with theinserting posts (36).
 6. The door handle safety lock according to claim1, the bottom of the said pedestal (2) is provided with non-settingadhesive (24), and the said pedestal (2) is fixed onto the door bodythrough the non-setting adhesive (24).
 7. The door handle safety lockaccording to claim 1, the outer wall of the said button (1) is providedwith a snap (12), and the inner wall of the second mounting hole (32) isprovided with a clamping slot (38) which is matched with the snap (12).8. The door handle safety lock according to claim 1, one end of the saidbutton (1) is provided with an accommodating and mounting cavity (13)which is matched with the spring (4).
 9. The door handle safety lockaccording to claim 1, the said retaining ribs (11) comprise a firstretaining rib (111) and a plurality of second retaining ribs (112), thewidth of the said first retaining rib (111) is greater than that of thesecond retaining rib (112), the quantity of the said first chutes (23)and the second chutes (33) is the same as that of the retaining ribs(11), a plurality of the said first chute (23) comprise three thirdchutes (231) which are matched with the first retaining ribs (111), thedistance between the adjacent said third chutes (231) corresponds to onefourth of the circumference to the first mounting hole (22), and aplurality of the said second chutes (33) comprise a fourth chute (331)which is matched with the first retaining rib (111).
 10. The door handlesafety lock according to claim 1, the quantity of the said insertingpart (21) is two.
 11. The door handle safety lock according to claim 1,the outer wall of the button (1) which is close to one end of theretaining ribs (11) is provided with bosses (14), and the inner wall ofthe said first mounting hole (22) is provided in an array manner with aplurality of grooves (221) which are matched with the bosses (14).